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"Charles Darwin, aged 51." Scanned from Karl Pearson, The Life, Letters, and Labours of Francis Galton. Photo originally from the 1859 or 1860. According to the son of Charles Darwin, Francis Darwin, this portait is by Messrs. Maull and Fox, ; he writes that "the date of the photograph is probably 1854; it is, however, impossible to be certain on this point, the books of Messrs. Maull and Fox having been destroyed by fire."